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Heat pumps by metro · California · checked October 19, 2026
Heat pumps in San Diego
Winters are mild, so almost any certified heat pump can heat the house; cooling efficiency and quiet running decide the choice. At California prices an efficient heat pump delivers heat for about $39.40 per million Btu, against $22.32 for a high-efficiency gas furnace.
What this means for your house: Mild winters and modest summers: comfort fixes and efficient equipment matter more than big heating savings.
Climate and sizing
Winters are mild, so almost any certified heat pump can heat the house; cooling efficiency and quiet running decide the choice. This is a dry climate: look at EER2, the efficiency on the hottest afternoons, as well as SEER2. Whatever the climate, the system should be sized from a room-by-room load calculation (ACCA Manual J), not from
the size of the old air conditioner or furnace: an oversized heat pumpshort-cycles, dehumidifies poorly and costs more.
Degree days: NOAA1991–2020 climate normals. Climate zone: IECC 2021 (PNNL county list). Housing: Census American Community Survey.
Seasonal COP: Seasonal COP is the heat delivered over a whole heating season, including electric backup heat and defrost, for a heat pump sized for the house. We pick the planning value by how cold the winter is (heating degree days) and set it slightly below modelled results (Dunsky/CCI 2024), because measured field performance tends to come in lower. For your own house, the HSPF2 rating of the system you choose and your installer's Manual J load calculation are the better guide.
Mild coastalCoastal California
Choosing equipment for San Diego’s climate
Small loads and high power prices, plus heat waves in homes built without AC.
Your heating and cooling loads are small, but California electricity costs far more than the national average, so waste still adds up. Many homes have no AC, and many older ones heat with wall or floor furnaces, so heat-wave planning and safe venting matter most. A good audit seals and insulates the attic, tests fuel-burning equipment and sizes any cooling for heat waves without oversizing.
What to look for in this climate
Southwest rules apply statewide: a new split AC needs at least 14.3 SEER2 plus an EER2 minimum, based on installation date.
A standard heat pump is enough here. The coastal airports average almost no nights at or below freezing, so you don't need a cold-climate heat pump.
Size cooling for heat waves with a Manual J load calculation, without oversizing.
Do these alongside the new system
Heat pump to replace a wall furnace. A ducted or ductless heat pump adds cooling for heat waves and heats efficiently. Cold-climate models aren't needed: the coastal airports almost never freeze.
Heat pump water heater. It moves heat instead of making it, and it needs a space that stays between 40°F and 90°F.
Mistakes to avoid
Desert-style oversized cooling at the coast. Your loads are small. An oversized system costs more and short-cycles, and you don't need cold-climate heating either.
Tightening a house with wall furnaces, untested. Open-flue wall furnaces risk backdrafting in a tighter house. Test before and after air sealing.
Heating and cooling both count here: winters are real, so the price of each unit of heat matters, but so does summer efficiency. Cost per million Btu of heat delivered into the house, at California's average residential prices from the EIA (electricity for
July 2026, gas as an annual average). Here a heat pump needs a seasonal COP above 4.4 to beat a 95% gas furnace, so at these prices gas stays cheaper to run; the case for a heat pump rests on replacing the air conditioner, cutting emissions or a time-of-use rate.
Against electric resistance heat (baseboards or an electric furnace), even a standard heat pump cuts the heating bill by about 60%.
Prices: EIA electricity · EIA natural gas. Your own rate plan may differ, especially on a time-of-use or heat pump rate.
What cooling costs in San Diego
Summer matters too. Air conditioning for a typical 1,600 sq ft single-family house with central air, at California's average residential
electricity price (33.6¢ per kWh, EIA, July 2026). In this dry climate, check EER2 as well as SEER2: EER2 rates efficiency on the hottest afternoons, when your bill and the power grid peak.
Yearly cooling electricity and cost by system efficiency in San Diego
Every heat pump program we found for the San Diego area, with the equipment rule that decides which models qualify. Checked against each
program's own page on October 19, 2026. Most utility programs need an AHRI-matched system; check the exact pairing in the AHRI directory before you sign.
TECH Clean California single-family heat pump HVAC incentives
Closed now
TECH Clean California (Energy Solutions, for California utilities under CPUC oversight)
Heat pump amountsNo amounts listed; the incentives are fully reserved.
Equipment ruleNot stated on the page.
Other conditionsParticipating (TECH-enrolled) contractors only.
StatusFully reserved: 'As of November 14, 2025, TECH Clean California single-family heat pump water heater and heat pump HVAC incentives are reserved statewide.' No reopening date.
California HEEHRA Phase I (IRA Home Electrification and Appliance Rebates)
Closed now
California Energy Commission, delivered through TECH Clean California
Heat pump amountsSingle-family heat pump HVAC: up to $8,000 (household income under 80% AMI) or up to $4,000 (80-150% AMI). Low-income multifamily: $7,500 for two-speed and $8,000 for variable-speed heat pumps. Moderate-income multifamily: up to 50% of eligible costs, max $14,000 per unit.
Equipment rule'Two-speed or variable-speed ENERGY STAR certified heat pump for space heating and cooling.' Single-family installs must replace an existing non-heat-pump source of space heating. From Jan. 1, 2026, systems 'must only contain refrigerants with a global warming potential (GWP) of 700 or lower'.
Other conditionsA TECH Clean California-certified, HEEHRA-trained contractor is required, and the reservation must be approved before installation. Since July 15, 2025, a project cannot receive both a TECH incentive and a HEEHRA rebate.
StatusClosed to new reservations. Single-family has been fully reserved statewide since Feb. 24, 2026, with unapproved requests waitlisted. Multifamily has been fully reserved since Sept. 1, 2026.
The federal rebate (formerly HEAR) pays up to $8,000 toward an ENERGY STAR certified heat pump for income-qualified households, through
the state. Since May 29, 2026 it covers only upgrades from existing electric equipment, and the installer must be on the state's
contractor list. California's status is in the program list above.
Audit programs, other rebates and help for lower-income homes: our San Diego guide.
Systems that suit San Diego
Winters here don't call for cold-weather ratings, so these are the certified systems with the highest EER2 (efficiency on the hottest afternoons) and SEER2, on current refrigerants, from ENERGY STAR's US listings. Rebadged twins with identical ratings are folded into one row.
How to read the tables: SEER2 is cooling efficiency over a season and EER2 on the hottest afternoons; HSPF2 is heating efficiency over a
season. Size is the rated output in BTU/h (12,000 BTU/h is
one ton). The AHRI number identifies the exact certified pairing for rebates. Full definitions: how to read the numbers.
Central systems that cool most efficiently on hot afternoons
Central systems that cool most efficiently on hot afternoons for San Diego
Tell us about your home and what you want to heat or cool. A person reads every request and replies with the contractors and rebate programs that serve your ZIP code.
